Recent pertussis outbreaks are of concern, but should not overshadow a dramatic decrease in disease rates documented during the past three decades.  In the following chart, I’ve compared regional trends in pertussis reporting and W.H.O. estimates of vaccine uptake  Note that vaccine coverage has changed little since 1990.
2. Berger S. Pertussis: Global Status, 2013. 353 pages, 511 graphs, 648 references. Gideon e-books, http://www.gideononline.com/ebooks/disease/pertussis-global-status/